Java tutorial
/* * Twittnuker - Twitter client for Android * * Copyright (C) 2013-2014 vanita5 <mail@vanita5.de> * * This program incorporates a modified version of Twidere. * Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package de.vanita5.twittnuker.fragment; import static de.vanita5.twittnuker.util.Utils.getDisplayName; import android.content.BroadcastReceiver; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.content.res.Resources; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.view.ActionMode; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView.MultiChoiceModeListener; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import android.widget.TextView; import org.mariotaku.querybuilder.Columns.Column; import org.mariotaku.querybuilder.RawItemArray; import org.mariotaku.querybuilder.Where; import de.vanita5.twittnuker.R; import de.vanita5.twittnuker.fragment.support.BaseSupportListFragment; import de.vanita5.twittnuker.provider.TweetStore.Filters; public abstract class BaseFiltersFragment extends BaseSupportListFragment implements LoaderManager.LoaderCallbacks<Cursor>, MultiChoiceModeListener { private ListView mListView; private SimpleCursorAdapter mAdapter; private ContentResolver mResolver; private ActionMode mActionMode; private final BroadcastReceiver mStateReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { if (getActivity() == null || !isAdded() || isDetached()) return; final String action = intent.getAction(); if (BROADCAST_FILTERS_UPDATED.equals(action)) { getLoaderManager().restartLoader(0, null, BaseFiltersFragment.this); } } }; public abstract Uri getContentUri(); @Override public boolean onActionItemClicked(final ActionMode mode, final MenuItem item) { switch (item.getItemId()) { case MENU_DELETE: { final Where where = Where.in(new Column(Filters._ID), new RawItemArray(mListView.getCheckedItemIds())); mResolver.delete(getContentUri(), where.getSQL(), null); break; } default: { return false; } } mode.finish(); return true; } @Override public void onActivityCreated(final Bundle savedInstanceState) { mResolver = getContentResolver(); super.onActivityCreated(savedInstanceState); mAdapter = createListAdapter(); setListAdapter(mAdapter); mListView = getListView(); mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL); mListView.setMultiChoiceModeListener(this); setEmptyText(getString(R.string.no_rule)); getLoaderManager().initLoader(0, null, this); setListShown(false); } @Override public boolean onCreateActionMode(final ActionMode mode, final Menu menu) { mActionMode = mode; getActivity().getMenuInflater().inflate(R.menu.action_multi_select_items, menu); return true; } @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { return new CursorLoader(getActivity(), getContentUri(), getContentColumns(), null, null, null); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { final View view = super.onCreateView(inflater, container, savedInstanceState); final View lv = view.findViewById(android.R.id.list); final Resources res = getResources(); final float density = res.getDisplayMetrics().density; final int padding = (int) density * 16; lv.setId(android.R.id.list); lv.setPadding(padding, 0, padding, 0); return view; } @Override public void onDestroyActionMode(final ActionMode mode) { } @Override public void onItemCheckedStateChanged(final ActionMode mode, final int position, final long id, final boolean checked) { updateTitle(mode); } @Override public void onLoaderReset(final Loader<Cursor> loader) { mAdapter.swapCursor(null); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { mAdapter.swapCursor(data); setListShown(true); } @Override public boolean onPrepareActionMode(final ActionMode mode, final Menu menu) { updateTitle(mode); return true; } @Override public void onStart() { super.onStart(); final IntentFilter filter = new IntentFilter(BROADCAST_FILTERS_UPDATED); registerReceiver(mStateReceiver, filter); } @Override public void onStop() { unregisterReceiver(mStateReceiver); super.onStop(); } @Override public void setUserVisibleHint(final boolean isVisibleToUser) { super.setUserVisibleHint(isVisibleToUser); if (!isVisibleToUser && mActionMode != null) { mActionMode.finish(); } } protected SimpleCursorAdapter createListAdapter() { return new FilterListAdapter(getActivity()); } protected abstract String[] getContentColumns(); private void updateTitle(final ActionMode mode) { if (mListView == null || mode == null || getActivity() == null) return; final int count = mListView.getCheckedItemCount(); mode.setTitle(getResources().getQuantityString(R.plurals.Nitems_selected, count, count)); } public static final class FilteredKeywordsFragment extends BaseFiltersFragment { @Override public String[] getContentColumns() { return Filters.Keywords.COLUMNS; } @Override public Uri getContentUri() { return Filters.Keywords.CONTENT_URI; } } public static final class FilteredLinksFragment extends BaseFiltersFragment { @Override public String[] getContentColumns() { return Filters.Links.COLUMNS; } @Override public Uri getContentUri() { return Filters.Links.CONTENT_URI; } } public static final class FilteredSourcesFragment extends BaseFiltersFragment { @Override public String[] getContentColumns() { return Filters.Sources.COLUMNS; } @Override public Uri getContentUri() { return Filters.Sources.CONTENT_URI; } } public static final class FilteredUsersFragment extends BaseFiltersFragment { @Override public String[] getContentColumns() { return Filters.Users.COLUMNS; } @Override public Uri getContentUri() { return Filters.Users.CONTENT_URI; } @Override protected SimpleCursorAdapter createListAdapter() { return new FilterUsersListAdapter(getActivity()); } private static final class FilterUsersListAdapter extends SimpleCursorAdapter { private int mUserIdIdx, mNameIdx, mScreenNameIdx; private final boolean mNameFirst, mNicknameOnly; public FilterUsersListAdapter(final Context context) { super(context, android.R.layout.simple_list_item_activated_1, null, new String[0], new int[0], 0); final SharedPreferences prefs = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); mNameFirst = prefs.getBoolean(KEY_NAME_FIRST, true); mNicknameOnly = prefs.getBoolean(KEY_NICKNAME_ONLY, false); } @Override public void bindView(final View view, final Context context, final Cursor cursor) { super.bindView(view, context, cursor); final TextView text1 = (TextView) view.findViewById(android.R.id.text1); final long user_id = cursor.getLong(mUserIdIdx); final String name = cursor.getString(mNameIdx); final String screen_name = cursor.getString(mScreenNameIdx); final String display_name = getDisplayName(context, user_id, name, screen_name, mNameFirst, mNicknameOnly); text1.setText(display_name); } @Override public Cursor swapCursor(final Cursor c) { final Cursor old = super.swapCursor(c); if (c != null) { mUserIdIdx = c.getColumnIndex(Filters.Users.USER_ID); mNameIdx = c.getColumnIndex(Filters.Users.NAME); mScreenNameIdx = c.getColumnIndex(Filters.Users.SCREEN_NAME); } return old; } } } private static final class FilterListAdapter extends SimpleCursorAdapter { private static final String[] from = new String[] { Filters.VALUE }; private static final int[] to = new int[] { android.R.id.text1 }; public FilterListAdapter(final Context context) { super(context, android.R.layout.simple_list_item_activated_1, null, from, to, 0); } } }